Malicious PDF — malware analysis report

Static analysis result for SHA-256 3038b33e2c700ba2…

MALICIOUS

PDF

86.7 KB Created: 2021-06-10 07:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb5c110d3f50d19130d666911e07936b SHA-1: ec3b8a1220ad3e8196d61d4e1f061c5d6af27d68 SHA-256: 3038b33e2c700ba21b48882363336deb0e7853bb52266386958b0d83efaa0d34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=download+beyonce+drunk+in+love+mp3 PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608076576e2de---janasirufirelimoreses.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f003902027---vuxew.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/81403262788.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1cd2887f4---ketifefu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fa7ef252b8---dakaka.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd99624c1a---pepaw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61daa0871---jusatinapotameg.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/roviv.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033f80ca53---81812064084.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b831924241d---fekusugipo.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tovujomizun.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6932ede9---61670172775.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/lpgn73ol3taqbub4idj2bdrgv4/44430549996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 3048 bytes
SHA-256: 014d319e252f583a2efd09f6be6163f180829dfaf8bac6c749f10706892dbbeb
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 5660 bytes
SHA-256: 2883ac0bd164b71ad7e27f5643faf3f866d9aae6a8bdbc9b8b73b4bcb44424bc
font_02_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 13320 bytes
SHA-256: 6bbe2f054aa92fa95af4c1b5e9eabfa07484e6089ed4f007cf6dd774b4725d62
font_03_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 17112 bytes
SHA-256: 8d931078a8bda077e62b6226989e9ca7a204b5b2ded984cec863dfc844f848f3